Control of micromagnetics in Permalloy nanomagnets by means of indentation
Control of micromagnetics in Permalloy nanomagnets by means of indentation
复制标题
通过压痕控制坡莫合金纳米磁体中的微磁性
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Welland
中科院分区：
文献类型：
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作者：
D. Koltsov;M. Welland
已知纳米磁体中交换和静磁相互作用的竞争会导致构型各向异性的形成。我们提出了一种通过边缘压痕控制各向同性坡莫合金方棱柱中的构型各向异性和底层微磁构型的有效方法。这种凹进方棱镜的有限差分微磁模型给出了五种基态微磁配置，其相对能量由结构尺寸和凹进深度决定。该系统的微磁相图是在尺寸压痕平面上构建的，并通过对纳米制造的坡莫合金结构进行直接磁光测量来确认。压痕的作用是抑制卷曲微磁构型，从而在大至 400 nm 的压痕结构中产生单畴行为。
The competition of exchange and magnetostatic interaction in nanomagnets is known to lead to the formation of configurational anisotropy. We present an effective method of controlling the configurational anisotropy and underlying micromagnetic configurations in isotropic Permalloy square prisms by edge indentation. Finite difference micromagnetic modeling of such indented square prisms gives five ground state micromagnetic configurations, the relative energies of which are determined by the structure size and depth of indentation. A micromagnetic phase diagram for the system is constructed on a size-indentation plane and is confirmed by direct magneto-optical measurements on nanofabricated Permalloy structures. The effect of indentation is to suppress curling micromagnetic configurations resulting in single domain behavior in indented structures as large as 400 nm.